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C++
class Student {
public:
	//Accessor
	int fetchAge();
	int *fetchDaysInCourse();
	string fetchEmail();
	string fetchFirstName();
	string fetchLastName();
	string fetchStudentId();
	Degree fetchDegreeType();
	//Mutators
	void mutateAge(int);
	void mutateDaysInCourse(int[1]);
	void mutateEmail(string);
	void mutateFirstName(string);
	void mutateLastName(string);
	void mutateStudentId(string);
	void mutateDegreeType(Degree);
	
	//other handlers
	virtual void print();
	virtual Degree fetchDegreeProgram();
	//constructor
	Student(int age, int daysInCourse[3], string studentId, string email, string firstName, string lastName, Degree degreeType);
	~Student();

private:
	int Age, DaysInCourse[1];
	string Email, FirstName, LastName, StudentId;
	Degree DegreeType;

};

C++
using namespace std;

int main() {

	//personal information for start screen
	cout << "Course Title: Scripting and Programming - Applications - C867 \n";
	cout << "Language used: C++ \n";
	cout << "Student ID: 467185 \n";
	cout << "Written by: Gregory Young \n\n";

	Roster classRoster;

	const string studentData[] =
	{
		"A1,John,Smith,John1989@gm ail.com,20,30,35,40,SECURITY",
 "A2,Suzan,Erickson,Erickson_1990@gmailcom,19,50,30,40,NETWORK",
 "A3,Jack,Napoli,The_lawyer99yahoo.com,19,20,40,33,SOFTWARE",
 "A4,Erin,Black,Erin.black@comcast.net,22,50,58,40,SECURITY",
 "A5,Gregory,young,gyoun15@wgu.edu,29,30,20,33,40,SOFTWARE"
	};

	//fill the class roster array
	for (int i = 0; i < sizeof(studentData) / sizeof(studentData[i]); i++) {
		cout << studentData[i] << endl;
		string input = studentData[i];
		istringstream ss(input);
		string token;
		string tempHolder[9];

		int x = 0;
		while (x < 9 && getline(ss, token, ',')) {
			tempHolder[x] = token;
			x += 1;
		}

		Degree studentDegree;
		if (tempHolder[8] == "NETWORK") {
			studentDegree = NETWORKING;
		}
		else if (tempHolder[8] == "SECURITY") {
			studentDegree = SECURITY;
		}
		else if (tempHolder[8] == "SOFTWARE") {
			studentDegree = SOFTWARE;
		}
		else {
			studentDegree = NODEGREE;
		}

		classRoster.add(tempHolder[0], tempHolder[1], tempHolder[2], tempHolder[3], std::stoi(tempHolder[4]), std::stoi(tempHolder[5]), std::stoi(tempHolder[6]), std::stoi(tempHolder[7]), studentDegree);
	}

	classRoster.printAll();
	cout << "\n";
	classRoster.printInvalidEmails();
	cout << "\n";
	for (int i = 0; i < sizeof(classRoster.classRosterArray) / sizeof(classRoster.classRosterArray[i]); i++) {
		classRoster.printDaysInCourse(classRoster.classRosterArray[i]->fetchStudentId());
	}
	cout << "\n";
	classRoster.printByDegreeProgram(SOFTWARE);
	cout << "\n";
	classRoster.remove("A3");
	classRoster.remove("A3");

	return 0;
}

void Roster::add(string studentID, string firstName, string lastName, string email, int age, int daysInCourse1, int daysInCourse2, int daysInCourse3, Degree degreeProgram)
{
	int courseDays[3] = { daysInCourse1, daysInCourse2, daysInCourse3 };

	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		if (classRosterArray[i] == nullptr) {
			if (degreeProgram == NETWORKING) {
				classRosterArray[i] = new NetworkStudent(age, courseDays, studentID, email, firstName, lastName, degreeProgram);
			}
			else if (degreeProgram == SECURITY) {
				classRosterArray[i] = new SecurityStudent(age, courseDays, studentID, email, firstName, lastName, degreeProgram);
			}
			else if (degreeProgram == SOFTWARE) {
				classRosterArray[i] = new SoftwareStudent(age, courseDays, studentID, email, firstName, lastName, degreeProgram);
			}
			else {
				classRosterArray[i] = new Student(age, courseDays, studentID, email, firstName, lastName, degreeProgram);
			}

			break;//stop 
		}
	}
}

void Roster::printAll()
{
	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		classRosterArray[i]->print();
	}
}

void Roster::printByDegreeProgram(int degreeProgram)
{
	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		if (classRosterArray[i]->fetchDegreeProgram() == degreeProgram) {
			classRosterArray[i]->print();
		}
	}
}

void Roster::printDaysInCourse(string studentID)
{
	float avg = 0;
	int max = 3;
	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		if (classRosterArray[i] != nullptr && classRosterArray[i]->fetchStudentId() == studentID) {
			int *daysInCourse = classRosterArray[i]->fetchDaysInCourse();
			for (int x = 0; x < max; x++) {
				avg += daysInCourse[x];
			}

			cout << "Student " << classRosterArray[i]->fetchStudentId() << "'s average number of days in each course is." << (avg / max) << "\n";
			break;
		}
	}
}

void Roster::printInvalidEmails()
{
	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		string email = classRosterArray[i]->fetchEmail();
		bool isValid = false;

		size_t found = email.find("@");
		if (found != string::npos) {
			found = email.find(".");
			if (found != string::npos) {
				found = email.find(" ");
				if (found == string::npos) {
					isValid = true;
				}
			}
		}

		if (!isValid) {
			cout << email << " is not a valid email address \n";
		}
	}
}

void Roster::remove(string studentID)
{
	bool studentRemoved = false;
	for (int i = 0; i < sizeof(classRosterArray) / sizeof(classRosterArray[i]); i++) {
		if (classRosterArray[i] != nullptr && classRosterArray[i]->fetchStudentId() == studentID) {
			classRosterArray[i] = nullptr;
			studentRemoved = true;
			break;
		}
	}

	if (studentRemoved == false) {
		cout << "ERROR: Student ID '" << studentID << "' was not found.";
	}
}

Roster::~Roster()
{
	delete * classRosterArray;
}
string Student::fetchEmail()
{
	return Email;
}


#include "Student.h"

//basic operation for return of requested information 

int Student::fetchAge()
{
	return Age;
}

int * Student::fetchDaysInCourse()
{
	return DaysInCourse;
}

void Student::mutateEmail(string email)
{
	Email = email;
}

string Student::fetchEmail()
{
	return Email;
}

string Student::fetchFirstName()
{
	return FirstName;
}

string Student::fetchLastName()
{
	return LastName;
}

string Student::fetchStudentId()
{
	return StudentId;
}

Degree Student::fetchDegreeType()
{
	return Degree();
}

void Student::mutateAge(int age)
{
	Age = age;
}


void Student::mutateDaysInCourse(int *daysInCourse)
{
	for (int i = 0; i < 3; i++) {
		DaysInCourse[i] = daysInCourse[i];
	}
}


void Student::mutateFirstName(string firstName)
{
	FirstName = firstName;
}

void Student::mutateLastName(string lastName)
{
	LastName = lastName;
}

void Student::mutateStudentId(string studentId)
{
	StudentId = studentId;
}

void Student::mutateDegreeType(Degree degreeType)
{
	DegreeType = degreeType;
}

Student::Student(int age, int daysInCourse[3], string studentId, string Email, string firstName, string lastName, Degree degreeType)
{
 mutateAge(age);
mutateStudentId(studentId);
mutateEmail(Email);
mutateFirstName(firstName);
mutateLastName(lastName);
mutateDegreeType(degreeType);
mutateDaysInCourse(daysInCourse);
mutateDegreeType(degreeType);
}

void Student::print()
{
	int *daysInCourse = fetchDaysInCourse();

	cout << fetchStudentId() << "\t";
	cout << "First Name: " << fetchFirstName() << "\t";
	cout << "Last Name: " << fetchLastName() << "\t";

	cout << "Age: " << fetchAge() << "\t";
	cout << "daysInCourse: " << daysInCourse[0] << "8" << daysInCourse[1] << "8" << daysInCourse[2] << "\t";

	cout << "Degree Program: ";
	switch (fetchDegreeProgram()) {
	case 0: cout << "Security";
		break;
	case 1: cout << "Networking";
		break;
	case 2: cout << "Software";
		break;
	case 4: cout << "Unknown or Unspecified";
		break;
	}
	
}

Degree Student::fetchDegreeProgram()
{
	return NODEGREE;
}

Student::~Student()
{
}


What I have tried:

I am getting a read access violation on the line Return Email; I have included the associated code from Student class as well. I am not really sure why it is running into a read access violation Email is apparently unable to read the characters from the string.
Posted
Updated 9-Nov-18 7:21am
v7
Comments
John R. Shaw 8-Nov-18 13:26pm    
Try "while (x < 9 && getline(ss, token, ','))" to start with.
gtyoung2 8-Nov-18 14:21pm    
That resolved that issue thank you! unfortunately, I have run into another error now reading for my fetch email function. It apparently has an issue reading the string, I have added this to the question above if you are willing to take a look
Richard MacCutchan 8-Nov-18 15:56pm    
Please edit your question with the updated code and explain exactly what the problem is and where it occurs.
gtyoung2 8-Nov-18 16:12pm    
done.
Richard MacCutchan 8-Nov-18 16:22pm    
Yes but you have not explained anything. We cannot guess what Email refers to.

1 solution

You need to use the debugger for solving that problem. Typical for your last problem is that the Student object is invalid like a null pointer or deallocated memory.

Set a break point some calls before that crash.
 
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